<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right" style="font-size: 16px">
      <el-breadcrumb-item :to="{ path: '/' }">后台管理</el-breadcrumb-item>
        <el-breadcrumb-item>类别列表</el-breadcrumb-item>
        <el-breadcrumb-item v-for="item in history"><span v-text="item.name"></span></el-breadcrumb-item>
    </el-breadcrumb>

      <el-divider></el-divider>

      <el-table :data="tableData" border style="width: 100%">
          <el-table-column prop="id" label="ID" width="60" align="center"></el-table-column>
          <el-table-column prop="name" label="名称" width="180" align="center"></el-table-column>
          <el-table-column prop="description" label="简介" header-align="center" :show-overflow-tooltip="true"></el-table-column>
          <el-table-column prop="sort" label="排序序号" width="80" align="center"></el-table-column>
          <el-table-column label="是否启用" width="80" align="center">
              <template slot-scope="scope">
                  <el-switch
                      @change="handleChangeEnable(scope.row)"
                      v-model="scope.row.enable"
                      :active-value="1"
                      :inactive-value="0"
                      active-color="#13ce66"
                      inactive-color="#999">
                  </el-switch>
              </template>
          </el-table-column>
          <el-table-column label="显示在导航栏" width="120" align="center">
              <template slot-scope="scope">
                  <el-switch
                      @change="handleChangeDisplay(scope.row)"
                      v-model="scope.row.isDisplay"
                      :active-value="1"
                      :inactive-value="0"
                      active-color="#13ce66"
                      inactive-color="#999">
                  </el-switch>
              </template>
          </el-table-column>
          <el-table-column label="子级类别" width="100" align="center">
              <template slot-scope="scope">
                  <el-button size="mini" :disabled="scope.row.isParent == 0"
                             @click="showSubCategories(scope.row)">查看
                  </el-button>
              </template>
          </el-table-column>
          <el-table-column label="操作" width="100" align="center">
              <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" circle
                             @click="handleEdit(scope.row)"></el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" circle
                             :disabled="scope.row.isParent == 1"
                             @click="openDeleteConfirm(scope.row)"></el-button>
              </template>
          </el-table-column>
      </el-table>
      <el-button style="margin-top: 10px; float: right;"
                 v-if="currentDepth != 1" @click="goBack()">返回
      </el-button>
  </div>
</template>

<script>
export default {
    data() {
        return {
            history: [],
            currentDepth: 1,
            currentParentId: 0,
            enableText: ['禁用', '启用'],
            displayText: ['不显示在导航栏', '显示在导航栏'],
            tableData: []
        }
    },
    methods: {
        goBack() {
            let parentCategory = this.history[--this.currentDepth - 1];
            this.history.pop();
            this.currentParentId = parentCategory.parentId;
            this.loadCategoryList();
        },
        showSubCategories(category) {
            this.history[this.currentDepth - 1] = category;
            this.currentDepth++;
            this.currentParentId = category.id;
            this.loadCategoryList();
        },
        handleChangeEnable(category) {
            let url = 'http://localhost:9080/categories/' + category.id;
            if (category.enable == 1) {
                url += '/enable';
            } else {
                url += '/disable';
            }
            console.log('url = ' + url);
            this.axios
                .create({'headers': {'Authorization': localStorage.getItem('jwt')}})
                .post(url).then((response) => {
                let responseBody = response.data;
                if (responseBody.state == 20000) {
                    this.$message({
                        message: '操作成功，已经将【' + category.name + '】的状态改为【' + this.enableText[category.enable] + '】！',
                        type: 'success'
                    });
                } else {
                    this.$message.error(responseBody.message);
                }
                this.loadCategoryList();
            });
        },
        handleChangeDisplay(category) {
            let url = 'http://localhost:9080/categories/' + category.id;
            if (category.isDisplay == 1) {
                url += '/display';
            } else {
                url += '/hidden';
            }
            console.log('url = ' + url);
            this.axios
                .create({'headers': {'Authorization': localStorage.getItem('jwt')}})
                .post(url).then((response) => {
                let responseBody = response.data;
                if (responseBody.state == 20000) {
                    this.$message({
                        message: '操作成功，已经将【' + category.name + '】的状态改为【' + this.displayText[category.isDisplay] + '】！',
                        type: 'success'
                    });
                } else {
                    this.$message.error(responseBody.message);
                }
                this.loadCategoryList();
            });
        },
        handleEdit(category) {
            let title = '提示';
            let message = '您正在尝试编辑【' + category.id + '-' + category.name + '】的类别详情，抱歉，此功能尚未实现……';
            this.$alert(message, title, {
                confirmButtonText: '确定'
            });
        },
        openDeleteConfirm(category) {
            let title = '提示';
            let message = '此操作将永久删除【' + category.name + '】类别，是否继续？';
            this.$confirm(message, title, {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                this.handleDelete(category);
            }).catch(() => {
            });
        },
        handleDelete(category) {
            let url = 'http://localhost:9080/categories/' + category.id + '/delete';
            console.log('url = ' + url);
            this.axios
                .create({'headers': {'Authorization': localStorage.getItem('jwt')}})
                .post(url).then((response) => {
                let responseBody = response.data;
                if (responseBody.state != 20000) {
                    this.$message.error(responseBody.message);
                }
                this.loadCategoryList();
            });
        },
        loadCategoryList() {
            let url = 'http://localhost:9080/categories/list-by-parent?parentId=' + this.currentParentId;
            console.log('url = ' + url);
            this.axios
                .create({'headers': {'Authorization': localStorage.getItem('jwt')}})
                .get(url).then((response) => {
                let responseBody = response.data;
                if (responseBody.state == 20000) {
                    this.tableData = responseBody.data;
                } else {
                    this.$message.error(responseBody.message);
                }
            });
        }
    },
    mounted() {
        this.loadCategoryList();
    }
}

// 【关于返回上一级的模拟演示】
// 页面刚刚打开时  ：currentParentId: 0,  currentDepth: 1,  history：[]
// 点击“电脑办公”时：currentParentId: 43, currentDepth: 2,  history：[{43-电脑办公}]
// 点击“电脑配件”时：currentParentId: 51, currentDepth: 3,  history：[{43-电脑办公}, {51-电脑配件}]
// 点击“硬盘”时   ：currentParentId: 58, currentDepth: 4,  history：[{43-电脑办公}, {51-电脑配件}, {58-硬盘}]
</script>

<style scoped>

</style>